I haven't had any problems with either of my bows. I have had an MQ-1 for 4 years and shot 20,000 + arrows through it.I marked the cam when it was originally set up and found very little change since then. I've had an Ultra 2 for 2 years and it's been fine. I haven't ever had any WC , but sounds like their about the best. But seems more like a replacement item on a Mathews to me !